Atom \( \mathrm{X} \) occupies the fcc lattice as well as alternate tetrahedral voids of the sam...

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Atom \( \mathrm{X} \) occupies the fcc lattice as well as alternate tetrahedral voids of the same lattice. The packing efficiency (in \%) of the resultant solid is closest to
(a) 25
(b) 35
(c) 55
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